Process of making waterproof composition for coating paper.



' Improvement in UNITED STA PATENT OFFICE.

BiIGNOB DO VERAOHEMIGAL A OORP MT ON.

PROCESS OI MAKING WATERPROOF COMPOSITION I03 COATING PAPER.

1,266,956. ll'c Drawing.

To all whom it may concern:

Be it known that I BRUNO Knmrnnn, a citizen of the United States residing at Winchester, in the county of llliddlesex and State of Massachusetts, have invented an Processes of Making Waterproof Composition for Coating Paper, of which the following is a specification.

This invention relates to a process of making waterproof composition for paper involving as essential ingredients stearicacid, ammonia, paraffin-wax or their equivalents, and a diluent, which me be applied to paper in liquid form, and the ammonia or its equivalent and the diluent eliminated, thereby leaving the stearic-acid and araffin-wax or their etlllYalBIltS deposite upon the paper and rcn ering the pa er substantially impervious to water. Sue a com osition forms the subject-matter of myapp ication #802,519, filed November 22, 1913. The molecules of the stearic-acid and paraflln-wax are separated in the liquid form of the composition and are thoroughly mixed, so that when left as a deposit upon the paper they are intimately associated together. Stearin or oleic acid or some other fatt acid may be employed in lieu of stearic-aci but as stearic-acid is well suited for the purpose and is easily obtainable and convenient to work, I refer its employment. Good results are 0 tained when equal amounts of stearic-acid and paraflin-wax are employed, but these relative proportions may be varied.

In carrying out my invention the stearicacid is saponified by a volatile alkalisuch as ammonium hydrate, thereby to form an ammonium soap, and as the temperature of formation and decomposition of ammonium soaps are very close I prefer to employ a closed vessel capable. of withstanding a pressure of say ISO-pounds per square inch when heated to a temperature between 125 C. and 200 C. In such a vessel having) a capacity of say 200 gallons I place 0- pounds of commercial stearic-acid, pounds of araflin-wax and 20-pounds of concentrated ammonium hydrate. The vessel is then closed and steam added at say 90- pounds pressure to produce a temperature of about 150 C. Some water is ful' by the condensation of the steam, Stlficlcnt to form the ammonium soap. This temperature is all to continue for say one Specification of Letters Patent.

Application fled Home! BB. W8. Serial Kc. 808,520.

7 in the presence Patented May 21, 1913.

half hour when the s'tearic-acid becomes sa-' ponified by the ammonium hydrate forming an ammonium soap and the paraffin which itself does not saponify becomes emulsified therewith, the whole formin a permanent emulsion. The emulsion is then allowed to cool to about 30 (1.; then water is added to bring the emulsion to about a 10% solid, and the whole thoroughly stirred. The composition is then ready for use. It may be drawn off, filteret. and shipped in barrels or other containers. As this is an aqueous emulsion the bulk of the water may be added at any time, even after shipment, if desired. In lieu of ammonium hydrate other volatile alkalies of this. character may be employed, such as ammonium-carbonate, the object being to form an ammonium soa with which the paraifin becomes emulsifie and which may be decomposed by the a plication of heat. In this condition the molecules of the stearic-acid and parafiin are separated and are thoroughly intermin led and when applied to the paper and en seqnently heated so that the water is evaporated and the ammonium soap decomposed and the ammonia driven oil, a thin uniform layer of mixed stearic-acid and paraffin is left as a deposit on the paper which renders the paper impervious to water.

I claim 1. The process herein described of making a waterproof composition for paper consisting n sa-ponifyin a fatty aci by a volae tile a huh, and emu sifying an unsaponifiable wax with the soap thus produced, formin an a ueous emulsion, and subsequently diluting t e emulsion w1th water.

2. The process herein described of making a waterproof composition in paper consisting in saponifymg stearic-acid b monium hydrate at. a moderatel hig t m. perature in a closed vessel in t e presence of water, and emulsifying araflin with the ammonium soap thus pr need and diluting the emulsion with water.

3. The method of emulsi mixture .which consists in ad ing ammonia to afatty acid to form an ammonium soap of parafiimwax, heating the mixture, and utilizing a suilicient quantity of water to form with the mixture a viscous mass.

'4. The -method of emulsifying a waxy mg a waxy mixture which consists in adding ammonia to stearic acid to form ammonium stearate in the presence of paraifin wax, heating the mixture, and utilizing a sufficient quantity of water to form with the mixture a viscous mass.

Iii testimony whereof, I have signed my name to this specification, in the presence of two subscribing witn BRUNO KNIFFLER.

Witnesses B. J. Nome, H. B. DAVIS. 

